From February to May the Mekong by the First Thai-Lao Friendship Bridge is sufficiently low that a sandy beach is exposed on the Thai side.
Makeshift restaurants open and inner tubes are available for hire. The water is very shallow and the current is slow for about 50 meters into the river.
But there are sink holes and people drown in the area nearly every year. Last year a boy got pulled in just under the bridge, and a friend also drowned trying to save him